3639377921 has 2 divisors, whose sum is σ = 3639377922. Its totient is φ = 3639377920.

The previous prime is 3639377893. The next prime is 3639377947. The reversal of 3639377921 is 1297739363.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2494503025 + 1144874896 = 49945^2 + 33836^2 .

It is an emirp because it is prime and its reverse (1297739363) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3639377921 - 2³⁰ = 2565636097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3639377921.

It is not a weakly prime, because it can be changed into another prime (3639377321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819688960 + 1819688961.

It is an arithmetic number, because the mean of its divisors is an integer number (1819688961).

Almost surely, 2^3639377921 is an apocalyptic number.

It is an amenable number.

3639377921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3639377921 is an equidigital number, since it uses as much as digits as its factorization.

3639377921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1285956, while the sum is 50.

The square root of 3639377921 is about 60327.2568661961. The cubic root of 3639377921 is about 1538.1867004197.

The spelling of 3639377921 in words is "three billion, six hundred thirty-nine million, three hundred seventy-seven thousand, nine hundred twenty-one".